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Laboratory Evaluation of Selected Insecticides on Field-Collected Populations of Bollworm and Tobacco Budworm Larvae

Samuel Polizzi and Gregory Payne


Although Bt insecticides remain effective, LC50 values recorded for bollworm larvae, collected and evaluated in 2003, were approximately 2-3 times higher than previously recorded during 1996 through 1997. Bollworm populations have remained susceptible to pyrethroid insecticides; however, tobacco budworm larvae are 10-25 times more resistant to cypermethrin when compared to the most susceptible field strain and laboratory susceptible strains. Furthermore, LC95 values gave increased sharply during the nine year study period. Spinosad remains the most effective insecticide tested to date.

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Document last modified 04/27/04